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The following snippet of code provides basic functionality to process files beginning
with the root directory and traversing through subsequent files and folders. The parameters to
function dirtree($root, $callback, $params) include: the starting or root directory,
a custom callback function that applies a process on each file, and a parameter that will be used
by the pre-defined callback function. The callback parameter may be a scalar value or an array of
values. In the example below it will be an associative array containing a single element for the
purpose of simplicity, as is apparent of the callback function definition.
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function dirtree ($root, $callback, $params)
{
if (!is_dir ($root.DIRECTORY_SEPARATOR))
return false; // root directory doesn't exist
$d = dir ($root.DIRECTORY_SEPARATOR);
while (false !== ($entry = $d->read ()))
{
$path = $root.DIRECTORY_SEPARATOR.$entry;
if (is_dir ($path) && $entry != "." && $entry != "..")
dirtree ($path, $callback, $params);
else if (is_file ($path))
$callback ($path, $params);
}
$d->close ();
}
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The callback function receives the path to the file (includes the filename), and the parameter
originally passed to function dirtree(...), which is propagated to the callback function.
The callback function is defined to delete all files on or before a specific date contained
in the parameter.
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function delfile ($fn, $params)
{
$ft = strtotime (date ("m/d/Y", filemtime ($fn)));
// delete files on or before the date parameter
if ($ft <= $params['date'])
unlink ($fn);
}
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In application -- the call to function dirtree(...) will be passed the parameters described above.
Following the parameters of root folder and callback function is the callback parameter itself, which in this case
contains a date that will be used by the callback function delfile(...) defined above. The callback parameter itself
could have been specified as just the date value, but instead an array was used so as to provide a template for
passing multiple parameters to the custom callback function.
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